[PATCH] Replace some adm_access batons in externals.c

Hi!

make check passed!

[[[
Use recursive locking when deleting an external. No need to make a
distinction between files and dirs as the previous code did.

* subversion/libsvn_client/externals.c
  (handle_external_item_change): Remove the adm_access functions and use
    svn_wc_{acqurire,release}write_lock instead.

Patch by: Daniel Näslund <daniel{_AT_}longitudo.com>
]]]